here is a feature request I got in a mail. It's a good one, so let's make it official.
Xpath Ignore Queries – essentially, I want to assert that the whole response matches a stored response, *but* allow for me to define xpath queries indicating what things can be ignored. For example, if a response has a date element that is expected to change, check that the whole response matches *except* for that date element. Parasoft’s SOAtest has a similar feature and it’s great for regression testing.
Product Guy for Ready! API, SoapUI and all things API